<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
</head>
<body>


</body>


<script>

    var a=1;


    var b='b'
    var c="abd";
    var d;
    var e=true;



    var f=3.14;

    console.log(a);
    console.log(a+b);

    console.log(b);
    console.log(c);
    console.log(a+c);

    console.log(a+d);
    console.log(e);
    console.log(f);
</script>
</html>